Reusable app-dev template v1.1 (project-name-agnostic). Adds: declarative sidecars + agent sidecar-request process, host-plugins-in-cockpit fix, sbx exec, Postgres/test-DB sidecar, persistent/resumable cockpit sessions, foundation/sequential git-workflow. 4 roles, 16 invariants, 11 ADRs, backend+frontend guardrails. No domain code.